2/2÷4/7= 2.4÷2/5= 14/15×3/8= 12÷4/7= 8-4/9=

问题描述:

2/2÷4/7= 2.4÷2/5= 14/15×3/8= 12÷4/7= 8-4/9=

4/7620/77/20217又5/9